Process of decorating articles of pottery and the like



Aug. 11, 1931. H. MARMORSTEIN 1,818,729

PROCESS OF DECORATING ARTICLES OF POTTERY AND THE LIKE Filed Nov. 1.1929 MMA fm 'MAMMQ IN VEN TOR. Bym/oa A TTORNEYS.

QQ -at Patented Aug. 11, 1931 UNITED STATES PATENT OFFICE HEINRICHMARMOBSTEIN, or CHICAGO, ILLINOIS Application filed November 1, 1929.Serial No. 404,181.

The invention relates. to a process of ornamenting an article made ofglass, pottery, porcelain, china-ware or the like in such a manner, thatthe article will appear to have l veins painted on its surface with dullroman old.

g Heretofore a process has been known, by

which the surface of such articles has been ornamented so that itreceived veins in bright gold and in order to ornament the article ofdull rom an gold, it was necessary not only to use expensive roman gold,but' also to go to the labour and trouble of painting the veins one byone onto the article to be decorated.

The object of the present invention therefore is to provide a process bywhich it will become unnecessary to use the expensive roman gold but usethe less expensive so called liquid bright gold, and by which it will beunnecessary to paint each vein by itself onto the article to beornamented.

The drawing forming a part of this specification illustrates a vasedecorated according to the present invention.

The process according to the present invention consists of the followingsteps:

An article to be treated is provided with a dull glazed surface. Theprocess of providing such a surface is well known and does not form apart of the present invention and is therefore not described in thisspecification.

The article to be decorated is then covered with a coat of so calledliquid bright gold. This is the trade name for a solution of gold,nitric acid, to which solution hydrochloric acid is added. Preferably 30grams of gold are dissolved in 350 grams of nitric acid and to thissolution 75 grams of hydrochloric acid are added. Care has to be takento entirely operator to come in contactl with the liquid without beingscalded.

T he solution is then kept lukewarm and the air-dried coat of gold isthen covered with a coat of this solution. It is necessary that thissecond coat covers the whole surface painted previously with gold. Thenthe article is left again to dry in the atmosphere and when it isthoroughly dry, it is burned in a kiln at a liquid gol-d fire i. e.about 1500o Fahrenheit. 6o After being burned the article is left in thekiln for three hours in order to permit it to cool off very slowly. Whenthe article I is taken out of the kiln it will appear, that the outercoat is practically burned to ashes, which may be washed olf by bathingthe article in lukewarm water and drying by and it will also appear,that the coat of liquid bright old has been exploded so, that the wholesurace is now covered with veins, which appear to 1le painted on thesurface with dull roman go Having described my invention and how thesame is to be performed, I claim as new and desire to secure by LettersPatent:

In a process of the class described the steps of covering an articlehaving a dull laz'ed surface with a coat of so called liquid right gold,drying said coat in the atmosphere, covering said gilded surfaceentirely with a coat of a solution consisting of Epsom salt dissolved inbeer, drying said second coat in the atmosphere, burning the articlein akiln at liquid gold fire, leaving the article for about cover thesurface to be decorated with the liquid bright gold. The article is thenleft to dry in the atmosphere and when the liquid gold is thoroughlyair-dried the surface cov- 45 ered by the gold is provided with a coatof a solution produced in the following manner: One part of Epsom saltis mixed with two parts of a malt brew and this mixture is heated untilthe salt is dissolved entirely and at a 50 degree of heat which permitsthe hand of the three hours in the kiln for cooling, and bathing thearticle in lukewarm water.

In witness whereof I aliix my signature.

HEINRICH MARMORSTEIN.

